@Documented
@Target(value={FIELD,METHOD,PARAMETER,LOCAL_VARIABLE})
@Retention(value=CLASS)
@Nonnull(when=UNKNOWN)
@TypeQualifierNickname
public @interface Nullable
The annotated element could be null under some circumstances.
In general, this means developers will have to read the documentation to
determine when a null value is acceptable and whether it is necessary to
check for a null value.
When this annotation is applied to a method it applies to the method return
value.